1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-normalize-unifield-struct.rs b/src/test/ui/associated-types/associated-types-normalize-unifield-struct.rs
new file mode 100644
index 000000000..a04525dcd
--- /dev/null
+++ b/src/test/ui/associated-types/associated-types-normalize-unifield-struct.rs
@@ -0,0 +1,24 @@
+// run-pass
+// Regression test for issue #21010: Normalize associated types in
+// various special paths in the `type_is_immediate` function.
+
+pub trait OffsetState: Sized {}
+pub trait Offset {
+    type State: OffsetState;
+    fn dummy(&self) { }
+}
+
+#[derive(Copy, Clone)] pub struct X;
+impl Offset for X { type State = Y; }
+
+#[derive(Copy, Clone)] pub struct Y;
+impl OffsetState for Y {}
+
+pub fn now() -> DateTime<X> { from_utc(Y) }
+
+pub struct DateTime<Off: Offset> { pub offset: Off::State }
+pub fn from_utc<Off: Offset>(offset: Off::State) -> DateTime<Off> { DateTime { offset: offset } }
+
+pub fn main() {
+    let _x = now();
+}